Tubular oxide optical microcavities with thin walls (< 100 nm) have been fabricated by releasing pre-stressed Y2O3/ZrO2 bi-layered nanomembranes. Optical characterization demonstrates strong whispering gallery modes with a high quality-factor and fine structures in the visible range, which are due to their high-index-contrast property (high refractive index in thin walls). Moreover, the strong axial light confinement observed in rolled-up circular nanomembranes well agrees with our theoretical calculation by using Mie scattering theory. Novel material design and superior optical resonant properties in such self-rolled micro-tubular cavities promise many potential applications e.g. in optofluidic sensing and lasing.
The synergy effect in nature could enable fantastic improvement of functional properties and associated effects. The detection performance of surface-enhanced Raman scattering (SERS) can be highly strengthened under the cooperation with other factors. Here, greatly-enhanced SERS detection is realized based on rolled-up tubular nano-resonators decorated with silver nanoparticles. The synergy effect between whispering-gallery-mode (WGM) and surface plasmon leads to an extra enhancement at the order of 105 compared to non-resonant flat SERS substrates, which can be well tuned by altering the diameter of micron- and nanotubes and the excitation laser wavelengths. Such synchronous and coherent coupling between plasmonics and photonics could lead to new principle and design for various sub-wavelength optical devices, e.g. plasmonic waveguides and hyperbolic metamaterials.
In this paper, the underwater applications of micro‐LED (light‐emitting diode) in light emission, optical detection, and solar cell are demonstrated. Based on a high‐bandwidth and low‐power micro‐LED array, duplex underwater wireless optical communication (UWOC) and underwater charging are realized. Using the non‐return‐to‐zero on‐off‐keying modulation scheme, the maximum modulation bandwidth and data rate of a micro‐LED transmitter in the 2.3 m duplex UWOC system are 251.3 MHz and 660 Mbps, respectively. In addition, the micro‐LED‐based photodetector can achieve maximum data rates of 52.5 and 60 Mbps at 0 and −5 V in the same UWOC system, respectively. Furthermore, while achieving the communication function, the micro‐LED is used to realize the collection of external light energy, which is successfully employed to drive a 660 nm laser diode, proving the photovoltaic power generation of micro‐LED. This experiment has made a breakthrough in the duplex UWOC system based on an InGaN micro‐LED array, and verifies significant potential of micro‐LED application in the field of duplex UWOC and underwater charging.
Due to the excellent optoelectronic properties, fast response time, outstanding power efficiency and high stability, micro-LED plays an increasingly important role in the new generation of display technology compared with LCD and OLED display. This paper mainly introduces the preparation methods of the GaN-based micro-LED array, the optoelectronic characteristics, and several key technologies to achieve full-color display, such as transfer printing, color conversion by quantum dot and local strain engineering.
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